# Oky Period Tracker vs Vimi

The clearest difference is rating: Vimi at 4.5 against Oky Period Tracker's 3.1. Vimi also leads on review sentiment (57% vs 33%) and update cadence (every 9 days vs every 6 weeks). Oky Period Tracker's advantage is in-app purchases (none vs 10) and ads (none vs shown). On price, monetization model and device support there is nothing between them.

Both are free to download. Vimi sells 10 in-app purchases, starting at $19.99 per month. Oky Period Tracker asks for nothing beyond the download.

Vimi holds the better App Store score, 4.5 against 3.1. That said, the two scores are not equally well evidenced: Vimi has 1.1K ratings behind it against 47, so its average is the more settled of the two. Written reviews point the same way: 33% of Oky Period Tracker's written reviews are positive against 57% of Vimi's.

Oky Period Tracker ships an update every 6 weeks, Vimi every 9 days. The most recent releases landed on November 3, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | Oky Period Tracker | Vimi |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.1 (47 ratings)](https://appshunter.io/ios/app/oky-period-tracker/id1551481098/reviews) | **[4.5 (1.1K ratings)](https://appshunter.io/ios/app/vimi-my-math-tutor/id6748574236/reviews)** |
| Number of ratings | 47 | **1.1K** |
| Positive reviews | 33.3% of reviews | **57.1% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 weeks | **Every 9 days** |
| Monetization | Free | Free |
| Best chart rank | — | **#122** |
| Size | 79 MB | 123 MB |
| Requires iOS | **15.1** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [UNICEF](https://appshunter.io/developer/446804206) | [VIMI ADAPTIVE LEARNING LTD](https://appshunter.io/developer/1826373818) |

## What reviewers say

### Oky Period Tracker

[App page](https://appshunter.io/ios/app/oky-period-tracker/id1551481098)

This app helps young girls manage their menstrual cycles. It offers personalized predictions, tracks body and mood changes, and provides reliable health information and tips. The goal is to make periods less stressful and empower users.

**Highlights:** Period tracking, Personalized predictions, Mood and body tracking, Health facts and tips, Stress-free period management

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Vimi

[App page](https://appshunter.io/ios/app/vimi-my-math-tutor/id6748574236)

**Currently charting:** #122 Top Free · Education (US App Store)

This AI-powered math tutor creates personalized learning paths to help users master math concepts. It offers adaptive lessons, clear explanations, and engaging exercises tailored to school curricula, making learning approachable and fun.

**Highlights:** Personalized learning paths, Adaptive lessons, Curriculum-aligned content, Clear explanations, Engaging exercises, Instant feedback and solutions, Progress tracking

**Features:** macOS Compatibility

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Vimi Monthly Premium | $19.99 | per month |
| summer_promotion | $19.99 | per month |
| Vimi Monthly Premium | $19.99 | per month |
| Vimi Monthly Premium | $19.99 | per month |
| Vimi monthly Premium | $19.99 | per month |
| Vimi Monthly Premium | $24.99 | per month |
| Vimi Quarterly Premium | $44.99 | per 3 months |
| Vimi 3 months subscription | $44.99 | per 3 months |
| Vimi Annual Premium | $94.90 | per year |
| Vimi Premium Annual | $154.99 | per year |


## Frequently asked questions

### Is Oky Period Tracker free?

Oky Period Tracker is free to download, with no in-app purchases.

### Is Vimi free?

Vimi is free to download, with in-app purchases available.

### Which has better reviews, Oky Period Tracker or Vimi?

Vimi is rated higher. Oky Period Tracker averages 3.1 out of 5 from 47 ratings, while Vimi averages 4.5 from 1.1K ratings.

### Do Oky Period Tracker or Vimi have ads?

Vimi shows ads; Oky Period Tracker does not.

### Which is updated more often, Oky Period Tracker or Vimi?

Oky Period Tracker ships an update every 6 weeks, and Vimi every 9 days. Most recently, Oky Period Tracker was updated on November 3, 2026 and Vimi on November 8, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*